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MACFLAP_NOTIF

MACFLAP_NOTIF: Host e41f.13fa.a55d in vlan 1 is flapping betwe en port Gi0/17 and port Po1

Getting these logs on server farm switch connected to 4500 switch through ether channel

Any ideas how to fix this issue.

1 REPLY
VIP Purple

MACFLAP_NOTIF

Hi SJ,

Can u paste the config of the both ports??

may be :

u have made a trunk port as port-fast. And the most easiest way of detection of loop (before the network goes down) is those flapping message you are getting. It does seems that your network is having a L2 loop.

Disable the port-fast (on both sides) and then see if you are getting the flapping message.

If you are brave enough, you can also apply bpdu-guard to the port-fast (if there is a loop, it will change the port to err-disable / shut).

Normally you would enable portfast on trunks with  spanning-tree portfast trunk since regular  spanning-tree portfast

would only works on access ports.

Regards

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